INFO: task syz-executor.0:6221 blocked for more than 143 seconds.
      Not tainted 5.15.156-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0  state:D stack:    0 pid: 6221 ppid:  4961 flags:0x00000005
Call trace:
 __switch_to+0x308/0x5e8 arch/arm64/kernel/process.c:518
 context_switch kernel/sched/core.c:5030 [inline]
 __schedule+0xf10/0x1e48 kernel/sched/core.c:6376
 schedule+0x11c/0x1c8 kernel/sched/core.c:6459
 rwsem_down_write_slowpath+0xd94/0x17e0 kernel/locking/rwsem.c:1165
 __down_write_common kernel/locking/rwsem.c:1292 [inline]
 __down_write kernel/locking/rwsem.c:1301 [inline]
 down_write_nested+0xec/0x130 kernel/locking/rwsem.c:1668
 inode_lock_nested include/linux/fs.h:824 [inline]
 filename_create+0x204/0x468 fs/namei.c:3835
 do_mknodat+0x1a0/0x694 fs/namei.c:3981
 __do_sys_mknodat fs/namei.c:4022 [inline]
 __se_sys_mknodat fs/namei.c:4019 [inline]
 __arm64_sys_mknodat+0xb0/0xcc fs/namei.c:4019
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

Showing all locks held in the system:
1 lock held by khungtaskd/27:
 #0: ffff800014b114e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:311
2 locks held by getty/3729:
 #0: ffff0000d26b4098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x40/0x50 drivers/tty/tty_ldsem.c:340
 #1: ffff80001a3de2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x414/0x1204 drivers/tty/n_tty.c:2158
2 locks held by syz-executor.0/6221:
 #0: ffff0000dcb76460 (sb_writers#30){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:377
 #1: ffff0000e8fa4188 (&type->i_mutex_dir_key#19/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:824 [inline]
 #1: ffff0000e8fa4188 (&type->i_mutex_dir_key#19/1){+.+.}-{3:3}, at: filename_create+0x204/0x468 fs/namei.c:3835
1 lock held by syz-executor.0/6228:
2 locks held by syz-executor.1/6373:
 #0: ffff0000c1276460 (sb_writers#30){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:377
 #1: ffff0000e8fa46d0 (&type->i_mutex_dir_key#19/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:824 [inline]
 #1: ffff0000e8fa46d0 (&type->i_mutex_dir_key#19/1){+.+.}-{3:3}, at: filename_create+0x204/0x468 fs/namei.c:3835
1 lock held by syz-executor.1/6380:
2 locks held by syz-executor.3/6603:
 #0: ffff0000eed66460 (sb_writers#30){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:377
 #1: ffff0000e8fa4c18 (&type->i_mutex_dir_key#19/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:824 [inline]
 #1: ffff0000e8fa4c18 (&type->i_mutex_dir_key#19/1){+.+.}-{3:3}, at: filename_create+0x204/0x468 fs/namei.c:3835
1 lock held by syz-executor.3/6607:
2 locks held by kworker/u4:8/7192:
2 locks held by syz-executor.1/8440:
2 locks held by syz-executor.0/8475:

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